It is common for children to find reading comprehensions boring and laborious.  A good way to prepare for the reading part of your child's SATs test, is to give them short, daily reading comprehensions (lasting no more than 15 - 20 minutes).  It is also good to tackle a whole practise SATs reading paper from time to time.  Remember that for the 3-mark questions, they need to write a few sentences and give a detailed answer.  I find that children are really motivated if you 'score' their answer out of 3.  It helps them to see where they are going wrong and where they need to improve.